Rotary burner for gas and oil



June 13, 1 944. 3, w GIBSON ROTARY BURNER FOR GASES AND bILs Filed April19, 1941 3 Sheets-Sheet 1 June 13, 1944. c. w. GIBSON ROTARY BURNER FORGASES AND OILS Filed April 19, 1941 5 Sheets-Sheet 2 10a, Jr??? 2/ 6:

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\ Jam Z6 June 13, 1944. c, w, GIBSON ROTARY BURNER FOR GASES AND OILSFiled April 19, 1941 3 Sheets-Sheet 3 J xi 3 Znvtflfor- Cr/[GtdzsarzPatented June 13, 1944 um'rso STATES PATENT OFFICE ROTARY BURNER FOR GASAND OIL Carl W. Gibson, Linden, N. J., assignor to Coppus EngineeringCorporation, Worcester, Mass., a corporation oi MassachusettsApplication April 19, 1941, Serial No. 389,297

15 Claims. (Cl. 158-11) The present invention relates to a burner of thegeneral type and principle disclosed by Dennis Patent No. 2,177,245,dated October 24, 1939, in which rotary motion, produced by discharge ofgaseous fuel under pressure, serves not only for propulsion ofcombustion-supporting air, but also for effecting an intimate andhomogeneous admixture of fuel and air.

The present invention provides a rotary burner of this type, whichoperates equally well whether the fuel be gas or atomized oil, orwhether both of these fuels be used simultaneously.

Other and further objects and advantages of the invention willhereinafter more fully appear from the following detailed descriptiontaken in connection with the accompanying drawings, in

which- Fig. 1 is a longitudinal sectional view of a burner embodying theinvention.

Fig. 2 is a larger scale fragmentary view of certain parts,substantially as seen from the line 2-4 of Fig. 1.

Fig. 3 is a sectional view along the line 3-3 of Fig. 2.

Fig. 4 is a view similar to Fig. 2 of a modified form of the device.

Fig. 5 is a fragmentary sectional view along the line 5-5 of Fig. 4.

Like reference characters refer to like parts in the different figures.

Burners of the type exemplified by the aforesaid Dennis patent areprimarily adapted for use where there is a supply of either natural ormanufactured gas. However, it has been found essential in manyinstallations to provide for the use of liquid fuels, such as oil, aswhen the supply of gas fails or is insufficient to maintain the properheat input for the furnace. In a satisfactory l and 5, the inner racesof which engage with and support a hollow shaft 6 extending axially ofthe casing and centrally thereof. The inner races of the bearings arespaced apart by a sleeve -1 and are locked to the shaft 6 by a threadedclamping ring 8 which engages with a ring 9 on the shaft 6 and holds thebearings in position.

On the inner end of the shaft 6 is positioned a fan ill, the hub Illa ofwhich is attached to the shaft by bolts II which extend through the huband through a collar I2 suitably secured to the combination burner thesubstitution of liquid fuel for gas must not affect the heat input,since otherwise the installation could not operate at maximum eillciencyat all times. Also, the change from liquid to gaseous fuel, or viceversa, must be quickly and readily effected.

As shown in Fig. 1, my improved burner provides the'usual hollowopen-ended casing or shell i which is adapted to fit within an openingin the wall of a furnace, not shown, and which supports the burner in aposition to deliver a combustible mixture to the combustion chamber ofthe furnace. Positioned centrally in casing l is .a hollow supportinghub 2, the same being here shown as carried by spider arms 2a which aresecured to casing l by bolts 3. The interior of hub 2 supports spacedsets of ball bearings outside of the shaft 6 as by being welded thereto.The blades of the fan l0 project substantially to the walls of thecasing I, as shown.

Also arranged to rotate with the shaft 6 is the hollow hub l3 of thefuel discharging device, the latter acting as a driver for the shaft 6and fan It. The hub I3 is held to the hub Illa of the fan by the boltsII and the. open end of the hub is closed by a cap it held in positionby screws l5.

Extending radially from the hub I 3 are two sets of hollow fueldischarging arms I64; and lib,

of each gas discharging arm is in direct communication, as shown, withthe interior space M inclosed by hub l3, but this is not true of the oildischarging arms Ilia; the latter extend clear through the ring or hubl3 and have their interiors connected, as hereinafter described, with amanifold member 38 arranged interiorly of the hub or ring l3.

All of the arms Ilia and ltb are secured to the hub I3, as by the screwsl1, Fig. 2, and each arm has a plurality of spaced openings or orificesI 8 through which the fuel (gas or atomized oil as the case may be) isdistributed, by the rotation of said arms over substantially the entirearea of the passage defined by the casing l and through which air forcombustion is propelled by the fan I0. As shown in Fig. 2, the openingsI8 are arranged to direct the discharging fuel at an angle to thedirection of the movement of the air through the casing, and the escapeof the fuel through these orifices by its reaction on the arms Iliaand/or l6b causes rotation of the entire structure connected to shaft 6,including the fan I0.

An elongated hollow sleeve I9 is supported. centrally of the shaft 6 bysuitable connecting webs to provide an annular space between the shaft 6and sleeve IQ for the passage of gas to the arms [6b. The hollow shaft 6and its attached interior sleeve I9 have their outer ends inclosed by anextension 2| secured as by bolts 22 to the spider hub 2, said extension2| carrying suitable packing means 2 la in surrounding relation to theend of rotary shaft 6, and having beyond this an interior chamber 24through which is extended the sleeve 19, the chamber 24 thuscommunicating with the annular space between the shaft 6 and sleeve l9.A gas supply pipe is suitably connected, as shown at 23, to the chamber24 and when the device -is used with gas as the fuel, the flow of gas,as indicated by the arrows 25, is to the interior space 44 of the hubl3, Figs. 2 and 3, and thence to the arms |6b. The discharge of gas fromthese arms causes rotation of the entire structure carried by shaft 6,including the fan I0, so that the fan draws air through the casing I tomix with the gas and provide for complete combustion.

The sleeve I9 at its inner end communicates with the manifold 38, andthe outer end of said sleeve beyond the chamber 24 runs in a suitablebushing 32 that is arranged in another chamber 3| of extension 2|, saidbushing 32 serving as a packing around the sleeve I9 and preventingcommunication between said chambers 24 and 3|.

The sleeve |9 supports centrally thereof an elongated tubular member 26;such support at the outer end of sleeve I9 is here shown as afforded byan interior hub or spacer 21 of said sleeve, which receives the tubularmember 26 and which is connected by thin webs or the like to the sleeve|9, so as to maintain communication between chamber 3| and the annularspace between sleeve l9 and tubular member 26. The latter a its innerend is threaded, as shown in Fig. 3, into a hollow member 42 having aflange connection 28 with the interior of sleeve l9, this connection,like that at 21, being by means of thin webs or spokes which maintainthe annular space between sleeve l9 and tubular member 26,

for the free passage therethrough, as indicated by arrows 29, 29, ofsteam supplied to the chamber 3|, as by a steam supply pipe 30.

The bore of tubular member 26 is the means by which fuel oil, foratomization and admixture with the steam, is conveyed to the manifold38- 34; within said chamber the end of tubular member 26 is surroundedby suitable packing rings 36, 36, adapted to prevent communicationbetween the chambers 3| and 35; said rings 36, 36 are adapted to becompressed and held in effective sealing condition by an apertured glandmember 31, adjustably threaded into the outer end of chamber 35.

In the form of my invention shown by Figs. 1, 2 and 3, the manifold 38,receiving steam and oil from the sleeve l9 and tube 26 for distributionto the hollow arms |6a, |6a, is of cruciform construction, as best shownin Fig. 2, to conform to the arrangement of its communicating arms |6a,|6a in alternate relation with the gas discharging arms I61), I61). Saidmanifold 38 has a central recess 39 in line withithe sleeve l9, andradiating from this recess are four passages 46, 40 that aline andcommunicate with the interiors of the hollow arms |6a, |6a. The manifold33 fits within the hub I3 and i locked to the hubs I3 and Illa forrotation therewith, being held in position by the inner ends of the arms|6a.

In the form of my invention shown by Figs. 2 and 3, the several arms|6a, |6a supplied by the manifold 38 have a common means for effectingatomization of the fuel oil, substantially along the axis of theburner's rotation, said means, as best shown in Fig. 3, including aplurality of radial apertures 43, 43 in hollow member 42 for thedischarge of the fuel oil across the passing stream of steam (arrows29), and also including beyond this zone of oil and steam admixture, asuitable nozzle 4| which, by discharging the mix ture at an increasedvelocity, serves to complete the atomization of the 011. received in thecentral recess 39 of manifold 38 and terminates short of the bottom ofsaid recess, so that the discharging atomized mixture impinging againstsaid bottom has opportunity to enter the several manifold passages 40,40 that communicate with the hollow arms |6a, |6a, Thus the atomizedmixture in entering the arms |6a, |6a is obliged to take an abrupt rightangle tum-this change in the path of the mixture assisting materially inexcluding from the arms I 6a, |6a any unatomized portions of the oilwhich might otherwise pass into said arms in the form of liquid drops.

In this form of my invention, the manifold 38 leaves spaces 44,. withinthe hub l3, by which gaseous fuel under pressure flowing through theannular space between members 6 and i9 is directed into the hollow armI612, I612, as best shown in Fig. 3provision being made for a smallquantity of this gas to escape centrally of the burner, by Way ofopenings 5| in the cap l4. Thus, in this form of my invention, there aretwo entirely separate fuel passages through one of which gas underpressure is directed to certain of the discharge arms, namely the arms|6b, I6b whose apertures I8 are especially proportioned and designed forthe discharge of gas. Such discharge will cause the gas dischargingdevice and the associated fan to rotate at such a speed that the properamount of air for combustion will be delivered for most eflicientoperation of the.

burner. Through the other passage, including the manifold 38, theatomized oil and steam when used as the fuel, is directed into the otherarms |6a, |6a whose apertures l8 are especially designed for thedischarge of such fuel in sufficient amount to effect rotation of thefuel discharging device at a rate to obtain the delivery by fan H] ofthe required amount of air for complete combustion of the atomized oil.

With reference to the different form of my invention shown by Figs. 4and 5, the arrangement is such that atomized oil mixed with steam isdelivered by a, different type of manifold to the hollow arms |6a, |6a.In this modification, as in the structure above described, the gas underpressure when used as the fuel is delivered to certain of the dischargearms by one path and when the device is used with atomized oil this fuelreaches the remaining arms through an entirely independent and.difierentpath. The device of Figs. 4 and 5 differs from that of Figs,1,2 and 3 only in certain parts beyond the inner ends of the tubularmembers 6, l9 and 26, for which reason it will be permissible in thefollowing description to employ in certain cases the same referencenumerals as used in Figs. 1, 2 and 3, and in other cases, where theelements have similar functions to those of the first-described form, to

This nozzle 4| is employ prime marks with the corresponding referencenumerals.-

In the device shown by Figs. 4 and 5, the manifold for the distributionof the fuel oil to the hollow arms lGa, lid is designated by the numeral38'; this manifold has a central recess 88' which is positioned at thedischarge end of the sleeve l9. This'manifold fits within the hub l8 andis suitably locked to the hubs I 8 and we for rotation therewith. Themanifold has radial passages 40' (in the example shown there are two ofthese passages) leading from the recess 88' to thearms lia, Ilia; eachpassage 48' has its own individual atomizing means for'the liquid fuelsupply, in contradistinction to the common atomizing means whichfeatures the device of Figs. 1, 2 and 3; said individual atomizing meansfor each passage 48' and its associated arm lBa is in part constitutedby a suitable nozzle 48 arranged at the outer end of said passage. Inthe recess 39' of manifold 38' is received an oil distributor 46 havinga central axial passage 48 in line with the bore of the tubularoil-supplying member. The distributor 46 has a plurality of radiallyextending webs 48" which hold the distrillilutor in spaced relation tothe recess bore or wa The distributor has opposed radial bores 41 whichaline with the nozzles 45 and serve for the centering in each passage40' of an individual atomizing device 48, which preferably has aplurality of radial webs 48 engageable with the walls of the passage tohold said device in spaced relation thereto. Each atomizer 48 has anaxial bore 49 communicating with the bore 46' of the distributor 46.Transverse bores 58 in each atomizer are located at the outer end of theatomizer and communicate with the end of the bore 48. When the device isoperated with oil as the fuel, the fiow of oil'is from the tubularmember 26 into the passage 46' and thence through the bores 49 and 58 ofatomizing devices 48 which discharge into As shown in Fig. 4, themanifold 38 extends diametrically of the hub l3 to communicate only withthe opposite arms [6a, and to leave entirely uncovered the inner ends ofthe arms 16b so that gas passing through the space between the shaft 8and sleeve l9 and into the hub i3 around the manifold, may be deliveredinto the arms Nib. Gas may also be discharged through openings in thecap l4, this cap also aiding in maintaining the manifold 38 in position.

When operating with gas under pressure as the fuel, the flow of gas isthrough the space between the sleeves 6 and i9 and into the arms lSb. Asthe gas escapes through the openings or discharge orifices in the armslBb the reaction on the arms causes rotation of the fuel distributor andthe fan i0 connected thereto which draws air for combustion through thecasing I around and outside of the spider 2 to assure a sufiicientsupply of air for complete combustion of the gas discharged from thearms [6b.

When the device is used for burning oil the oil is directed through theinlet port 34 to pass through the tubular member 28 into the bore 40'and then through the bores 48 and 50 to the atomizer nozzles 45, 45. Atthe same time steam or other gaseous material for atomizing the oil andfor mixing therewith is directed through the steam inlet port 88 intothe space between the sleeves l8 and 26 and into the bores 40' in whichthe atomizer nozzles are positioned. As the oil escapes through theports 58 it is picked up and carried with the steam through the nozzles45, 45 for its further atomization, and into the arms lGa to bedischarged through the orifices in these arms. The discharge of theatomizedoil causes rotation of the distributing arms, together with thefan for drawing air for combustion through the casing i.

It will be understood that the fuel oil being in liquid form does notneed to be delivered to the burners of my invention in as large quantityas does the gas if the same number of heat units are to be supplied tothe boiler or other device which is served by such a burner. Because ofthis, a smaller number of oil-discharging arms I 6a may be utilized, asin Figs. 4 and 5, or in many instances a smaller number of orifices inthe arms I Ba will suilice for assuring an output by said burner of thesame number of heat units as the same burner would deliver if gas werebeing supplied through the arms I'Sb. Where oil is used it is stillessential that equally large quantities of air be delivered to theburner for complete combustion, and by balancing the proportionatenumber of arms and orifices for the delivery of atomized oil, and forthe delivery of gas, th proper quantity of air will always b supplied,whether oil or gas is used for the combustible fuel. Moreover, the useof steam under pressure to mix with the oil causes the discharge of themixture through the orifices of the arms 16a at a considerably higherpressure than the discharge of gas through the arms "5b with aresultantly greater reaction on the arms to cause rotation of thedischarge device and the fan. Thus a smaller number of dischargeopenings are necessary to obtain the desired rate of rotation of thefan.

Since the above described devices will function selectively with either011 or gas as a fuel, it will be obvious that both oil and gas may beused simultaneously where such an operation is desirable, as where thesupply of gas is not suiiicient to maintain the desired input of heatunits. and thus requiring the burning of a certain amount of fuel oil,in order to attain maximum efilciency of the boiler or other devicewhich is served by my improved burner.

I claim:

1. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel supply conduitextending lengthwise of said passage, a rotatably mounted air-propellingfan in said passage, a set of hollow arms in substantially radialrelation to said conduit and in communication therewith to receivegaseous fuel under pressure therefrom, said set of arms being rotatablymounted in said casing substantially coaxially with said fan, and eacharm being apertured for the reaction jet discharge of said gaseous fuelunder Pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, a second set of similarly mounted hollow armsapertured for rotation-producing reaction jet discharge of atomizedliquid fuel, said fan being operatively connected to both sets of armsfor rotation in unison therewith,

means extending axially through said conduit for supplying liquid fueland an atomizing medium under pressure to the arms of said second setnear th axis of said sets rotation, and means substantially in said axisfor atomizing said liquid fuel by said medium.

2. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel supply con .luitextending lengthwise of said passage, a rotatably mounted air-propellingfan in said passage, a set of hollow arms in substantially radialrelation to said conduit and in communication therewith to receivegaseous fuel under pressure therefrom, said set of arms being rotatablymounted in said casing substantially coaxially with said fan, and

each arm being apertured for the reaction jet discharge of said gaseousfuel under pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, a second set of similarly mounted hollow armsapertured for rotation-producing reaction jet discharge of atomizedliquid fuel, said fan being operatively connected to both sets of armsfor rotation in unison therewith, means extending axially through saidconduit for supplying liquid fuel, an atomizing medium under pressure tothe arms of said second set near said sets axis of rotation, and meanscommon to the arms of said second set, substantially in said axis, foratomizing said liquid fuel by said medium.

3. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel supply con- 1 duitextending lengthwise of said passage, a rotatably mounted air-propellingfan in said P sage, a set of hollow arms in substantially radialrelation to said conduit and in communication therewith to receivegaseous fuel under pressure therefrom, said set of arms being rotatablymounted in said casing substantially coaxially with said fan, and eacharm being apertured for th reaction jet discharge of said gaseous fuelunder pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, a second set of similarly mounted hollow armsapertured for rotation-producing reaction jet discharge of atomizedliquid fuel, said fan being operatively connected to both sets of armsfor rotation in unison therewith, means extending axially through saidconduit for supplying liquid fuel and an atomizing medium under pressureto the arms of, said second set, and means individually associated witheach arm of said second set for atomizing said liquid fuel by saidmedium.

4. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel supply conduitextending lengthwise of said passage, a rotatably mounted air-propellingfan in said passage, a set of hollow arms in substantially radialrelation to said conduit and in communication therewith to receivegaseous fuel under pressure therefrom, said set of arms being rotatablymounted in said casing substantially coaxially with said fan, andeacharm being apertured for the reaction jet discharge of said gaseousfuel under pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, a second set of similarly .mounted hollow armsapertured for rotation-producing reaction jet discharge of atomizedliquid fuel, said fan being operatively connected to both sets of armsfor rotation in unison therewith, means extending axially through saidconduit for supplying liquid fuel and steam-for discharge by the arms ofsaid second set for effecting admixture of the steam and oil and thelatter's atomization, substantially at the inner ends of said arms.

5'. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel suppl conduitextending lengthwise of said passage, 3, rotatably mountedair-propelling fan in said passage, a set of hollow arms insubstantially radial relation to said conduit and in communicationtherewith to receive gaseous fuel under pressure therefrom, said set ofarms being rotatably mounted in said casing substantially coaxially withsaid fan, and each arm being apertured for the reaction jet discharge ofsaid gaseous fuel under pressure, .to produce thereby the rotation ofsaid set of rotatably-mounted arms, a second set of similarly mountedhollow arms apertured for rotation-producing reaction jet discharge ofatomized liquid fuel, said fan being operatively connected to both'setsof arms for rotation in unison therewith, means extending axiallythrough said conduit for supplying liquid fuel and a gaseous atomizingmedium therefor, in separate channels, for delivery to the inner ends ofthe arms of said second set, and atomizing means near said inner endsfor bringing said liquid fuel and said medium into admixture and intofuel-atomizing relation.

6. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel supply conduitextending lengthwise of said passage, a rotatably mounted air-propellingfan in said passage, a set of hollow arms in substantially radialrelation to said conduit and in communication therewith to receivegaseous fuel under pressure therefrom, said set of arms being rotatablymounted in said casing substantially coaxially with said fan, and eacharm being apertured for the reaction jet discharge of said gaseous fuelunder pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, a second set of similarly mounted hollow armsapertured for rotation-producing reaction jet discharge of atomizedliquid fuel, said fan being operatively connected to both sets of armsfor rotation in unison therewith, means extending axially through saidconduit for supplying liquid fuel and a gaseous atomizing mediumtherefor, in separate channels, for delivery to said second set of arms,and atomizing means near the inner ends of said arms for bringing saidliquid fuel and said medium into admixture and into fuel-atomizingrelation, said last-named means including a nozzle receiving saidmixture in the axis of rotation of said arms, and a surface, transverseto said axis, against which said mixture is impinged by said nozzle.

'1. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel supply conduitextending lengthwise of said passage, a rosaid srcond set of arms, andmeans common to tatably mounted air-propellingfan in said passage, a setof hollow arms in substantially radial relation to said conduit and incommunication therewith to receive gaseous fuel under pressuretherefrom, said set of arms being rotatably mounted in said casingsubstantially coaxially with said fan, and each arm being apertured forthe reaction jet discharge of said gaseous fuel under pressure, toproduce thereby the rotation of said set of rotatably-mounted arms, asecond set of similarly mounted hollow arms apertured forrotation-producing reaction jet discharge of atomized liquid fuel, saidfan being operatively connected to both sets of arms for rotation inunison therewith, means extending axially through said conduit forsupplying liquid fuel and a gaseous atomizing medium therefor, inseparate channels, for delivery to said second set of arms, andatomizing means near the inner ends of said arms for bringing saidliquid fuel and said medium into admixture and into fuel-atomizingrelation, said last-named means including a nozzle at the entrance toeach arm for receiving said mixture and increasing its velocity.

8. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a gaseous fuel supply conduitextending lengthwise of said passage, a rotatably mounted air-propellingfan in said passage, a set of hollow arms in substantially radialrelation to said conduit and in communication therewith to receivegaseous fuel under pressure therefrom, said set of arms being rotatablymounted in said casing substantially coaxialiy with said fan, and eacharm being apertured for the reaction jet discharge of said gaseous fuelunder pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, a second set of similarly mounted hollow armsapertured for rotation-producing reaction Jet discharge of atomizedliquid fuel, said fan being operatively connected to both sets of armsfor rotation in unison therewith, means extending axially through saidconduit for supplying liquid fuel and steam under pressure, in separatechannels, for delivery to said second set of arms, means adjacent theinner ends of said arms for directing the liquid fuel into admixturewith the steam in a direction substantially transverse to the flow ofthe steam, and an atomizing nozzle receiving said mixture and increasingits velocity.

9. In a rotary burner for gas and oil, a casing forming a passage forcombustion-supporting air, a conduit for gas under pressure extendinglengthwise of said passage, an air-propelling fan rotatably mounted insaid conduit, a plurality of rotatably mounted hollow arms extendingsubstantially radially of said conduit, and connected to said fan toimpart their rotation thereto, said arms being apertured for thedischarge of fuel media under pressure in a plurality of Jets adapted toproduce by reaction the rotation of said arms and said fan, some of saidarms communicating with said conduit to receive gas under pressure, anddischarge same into the air stream produced by said fan when the burneris operating on gas as its fuel, oil supply means and steam supply meansboth extending axially through said conduit to the zone of said arms,means in said zone for mixing the oil and steam and for atomizing theoil, and means for distributing said atomized mixture to the otherhollow apertured arms for discharge into said air stream, when theburner is operating on oil as its fuel.

10. In a burner construction of the class described, a casing forming apassage for wmbuiition-supporting air, a gaseous i'ue1 supply conduitextending lengthwise of and rotatably mounted in said passage, anair-propelling fan secured to said conduit, a set of hollow arms securedto and radiating from said conduit and in communication therewith toreceive gaseous fuel under pressure therefrom, each arm being aperturedfor the reaction jet discharge of said gaseous fuel under pressure, toproduce thereby the rotation of said conduit and with it said fan, a.second set rotation-producing reaction jet discharge of of similarlyarranged hollow arms apertured for through said conduit for supplyingliquid fuel and steam for discharge by said second set of arms, andmeans common to the arms of said second set for effecting admixture ofthe steam and liquid fuel and the latters atomization substantially atthe inner ends of the arms of said second set.

11. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a rotatably mounted air-pro.pelling fan in said passage, a set of hollow arms rotatably mounted insaid casing substantially coaxialiy with said fan, each arm beingapertured for reaction jet discharge of atomized liquid fuel underpressure, to produce thereby the rotation of said set ofrotatably-mounted arms, said fan being operatively connected to said setof arms for rotation in unison therewith, means extending axiallythrough said casing for conveying separate supplies of a liquid fuel anda gaseous atomizing medium under pressure to the vicinity of said armsfor introduction thereto, and means substantially in the axis ofrotation of said arms for atomizing said liquid fuel by said medium.

12. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a rotatably-mountedair-propelling fan in said passage, a set of hollow arms rotatablymounted in said casing substantially coaxialiy with said fan, each armbeing apertured for the reaction Jet discharge of atomized liquid fuelunder pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, said fan being operatively connected to said setof arms for rotation in unison therewith, means extending axiallythrough said casing for conveying separate supplies of a liquid fuel andan atomiz ing medium under pressure to the vicinity of said arms forintroduction thereto, and means common to said arms, substantially inthe axis of their rotation, for atomizing said liquid fuel by saidmedium.

13. In a burner construction of the class described, a casing forming apassage for combustion-supporting air, a rotatably mountedair-propelling fan in said passage, a set of hollow arms rotatablymounted in said casing substantially coaxialiy with said fan, each armbeing apertured for the reaction Jet discharge of atomized liquid fuelunder pressure, to produce thereby the retation of said set ofrotatably-mounted arms, saidfan being operatively connected to said setof arms for rotation in unison therewith, means extending axiallythrough said conduit for supplying liquid fuel and an atomizing mediumunder pressure to each arm of said set, and means individuallyassociated with each arm of said set for atomizing said liquid fuel bysaid medium.

14. In a. burner construction of the class described, a casing forming apassage for combustion-supporting air, a rotatably mountedair-propelling fan in said passage, a set of hollow arms rotatablymounted in said casing substantially coaxialiy with said fan, each armbeing apertured for the reaction jet discharge of atomized liquid fuelunder pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, said fan being operatively connected to said setof arms for rotation in unison therewith, means ex-' tending axiallythrough said casing, for supplying liquid fuel and a gaseous atomizingmedium therefor, in separate channels, for delivery to themteriors ofsaid arms, and atomizing means near the inner ends of said arms forbringing said liquid fuel and said medium into admixture and intoruel-atomizing relation, said last-named means including a nozzlereceiving said mixture in the axis oi rotation otv said arms and asurface,- trans verse to said axis, against which said mixture isimpinged by said nozzle.

15. In a burner construction or the class described, a casing forming apassage for combustion-supporting air, a rotatably mountedair-'propelling tan in said passage. a set oi. hollow arms rotatablymounted in said casing substantially coaxially with said ian,'each ambeing apertured tor th reaction Jet discharge of atomized liquid fuelunder pressure, to produce thereby the rotation of said set ofrotatably-mounted arms, said tan being operatively connected to said setof arms for rotation in unison therewith, means extending axiallythrough said casing for supplying liquid fuel and a gaseous atomizingmedium therefor, in separate channels, for delivery to the interiors ofsaid arms, and atomizing means near the inner ends of said arms forbringing said liquid fuel and said medium into admixture and intofuel-atomizing relation. said last-named means including a nomle at thentrance to each arm for receiving said mixture and increasing itsvelocity as it enters each of said arms.

. CARL W. GIBSON.

